Fix NOTES section formatting in comment-based help (#26512)

test/powershell/Language/Scripting/ScriptHelp.NotesFormatting.Tests.ps1

@@ -0,0 +1,27 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+Describe 'Comment-based help NOTES section formatting' -Tags "CI", "Feature" {
+    It 'NOTES section should have single blank line after header and 4-space indentation' {
+        $helpText = Get-Help Remove-PSSession -Full | Out-String
+        $lines = $helpText -split "`r?`n"
+
+        # Find NOTES section
+        $notesIndex = -1
+        for ($i = 0; $i -lt $lines.Count; $i++) {
+            if ($lines[$i] -match '^NOTES\s*$') {
+                $notesIndex = $i
+                break
+            }
+        }
+
+        $notesIndex | Should -BeGreaterThan -1 -Because "NOTES section should exist"
+
+        # The line after NOTES header should be blank
+        $lines[$notesIndex + 1] | Should -Match '^\s*$' -Because "There should be a blank line after NOTES header"
+
+        # The second line after NOTES header should have content with 4-space indentation
+        $contentLine = $lines[$notesIndex + 2]
+        $contentLine | Should -Match '^[ ]{4}\S' -Because "Content should have exactly 4-space indentation"
+    }
+}